POLYFUSE

ABSTRACT

A fuse is a one time over current protection device employing fusible link that melts after the current exceeds a certain level for a certain length of time. Typically, a wire or chemical compound breaks the circuit when the current exceeds the rated value.

Polyfuse is a new standard for circuit protection .It is resettable. Technically, Polyfuses are not fuses but polymeric positive temperature coefficient thermistors (PPTC). Re-settable fuses provide over current protection and automatic restoration.

CONTENTS


1. INTRODUCTION
2. THE BASICS
3. PRINCIPLE OF OPERATION
4. OPERATING PARAMETERS
5. DESIGN CONSIDERATIONS
6. DESIGN CRITERIA
7. DIFFERENT TYPES OF POLYFUSES
8. EDGES OVER CONVENTIONAL FUSES
9. APPLICATIONS
10. CONCLUSION
11. REFERENCE